Related Party Transactions (Details) (Subsidiary Bank [Member], USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Subsidiary Bank [Member]
Indebted to subsidiary bank [Roll Forward]
Balance, beginning	$ 18,415,000	$ 12,647,000
Decrease due to status changes	(11,032,000)	0
Principal additions	2,494,000	68,110
Principal payments	(1,079,000)	(10,430)
Balance, ending	8,798,000	18,415,000
Unused commitments to extend credit	1,700,000	3,800,000
Related party deposit	$ 8,800,000	$ 7,000,000